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Mirrors > Home > MPE Home > Th. List > elfv2ex | Structured version Visualization version GIF version |
Description: If a function value of a function value has a member, then the first argument is a set. (Contributed by AV, 8-Apr-2021.) |
Ref | Expression |
---|---|
elfv2ex | ⊢ (𝐴 ∈ ((𝐹‘𝐵)‘𝐶) → 𝐵 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1 6 | . 2 ⊢ (𝐵 ∈ V → (𝐴 ∈ ((𝐹‘𝐵)‘𝐶) → 𝐵 ∈ V)) | |
2 | fv2prc 6705 | . . . 4 ⊢ (¬ 𝐵 ∈ V → ((𝐹‘𝐵)‘𝐶) = ∅) | |
3 | 2 | eleq2d 2898 | . . 3 ⊢ (¬ 𝐵 ∈ V → (𝐴 ∈ ((𝐹‘𝐵)‘𝐶) ↔ 𝐴 ∈ ∅)) |
4 | noel 4296 | . . . 4 ⊢ ¬ 𝐴 ∈ ∅ | |
5 | 4 | pm2.21i 119 | . . 3 ⊢ (𝐴 ∈ ∅ → 𝐵 ∈ V) |
6 | 3, 5 | syl6bi 255 | . 2 ⊢ (¬ 𝐵 ∈ V → (𝐴 ∈ ((𝐹‘𝐵)‘𝐶) → 𝐵 ∈ V)) |
7 | 1, 6 | pm2.61i 184 | 1 ⊢ (𝐴 ∈ ((𝐹‘𝐵)‘𝐶) → 𝐵 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2110 Vcvv 3495 ∅c0 4291 ‘cfv 6350 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-nul 5203 ax-pow 5259 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4833 df-br 5060 df-dm 5560 df-iota 6309 df-fv 6358 |
This theorem is referenced by: (None) |
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